5(b) Visual System

5(b) Visual System - Foundations of Occupation Foundations...

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Unformatted text preview: Foundations of Occupation: Foundations of Occupation: Neuroscience Neuroscience Lecture 5: The Visual System Outline Outline 1. Oculomotor System & Movements 2. Structures 3. Central Visual Pathway 4. Clinical Correlates a. Retinal Disorders b. Lesions Introduction to Sensation Introduction to Sensation Receive information from the environment Extract attributes of stimulus Sensory systems have a common organization ◦ Receptor: transduces energy into electrical stimulation (AP) ◦ Chain of neurons ◦ Importance of thalamus ◦ Sensory regions of cortex ◦ Topographically organized The Visual System The Visual System Provides: – Eye movement control – Sight – Information used in postural and limb movement control Oculomotor System Oculomotor System Extraocular muscles control eye movements Enable us to coordinate head and eye movements 3 pairs of extraocular muscles: ◦ medial and lateral rectus: adduction and abduction ◦ superior and inferior rectus: elevation and depression ◦ superior oblique: when eye adducted, down; with abduction, rotates eye ◦ inferior oblique: when eye adducted, up; with abduction, rotates eye Cranial Nerves Cranial Nerves • Innervate extraocular muscles • III (Oculomotor): – Nucleus in midbrain – Superior, medial & inferior rectus, inferior oblique • IV (Trochlear) – Nucleus in midbrain – Superior oblique • VI (Abducens) – Nucleus in pons – Lateral rectus Eye Movements...
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5(b) Visual System - Foundations of Occupation Foundations...

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